Fix incorrect paint on Timeline header

Fix an incorrect thin lines that appear on the top left of the timeline
palette when running the application then opening a project, then
opening the timeline data input dialog then click an empty area of the
timeline.

Task-number: QT3DS-1923
Change-Id: I3ab4fc677aeecf4c5cd5d6a61f5a4a447f52536f
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>

2 files changed, 4 insertions, 3 deletions

diff --git a/src/Authoring/Studio/Palettes/TimelineGraphicsView/SelectionRect.cpp b/src/Authoring/Studio/Palettes/TimelineGraphicsView/SelectionRect.cpp
index f04165e8..429b0170 100644
--- a/src/Authoring/Studio/Palettes/TimelineGraphicsView/SelectionRect.cpp
+++ b/src/Authoring/Studio/Palettes/TimelineGraphicsView/SelectionRect.cpp
@@ -51,7 +51,8 @@ void SelectionRect::paint(QPainter *painter, const QStyleOptionGraphicsItem *opt
 void SelectionRect::start(const QPointF &origin)
 {
     m_rect.setTopLeft(origin);
-
+    m_rect.setWidth(0);
+    m_rect.setHeight(0);
     m_active = true;
 }
 
@@ -77,7 +78,7 @@ void SelectionRect::end()
     m_active = false;
 }
 
-bool SelectionRect::isActive()
+bool SelectionRect::isActive() const
 {
     return m_active;
 }
diff --git a/src/Authoring/Studio/Palettes/TimelineGraphicsView/SelectionRect.h b/src/Authoring/Studio/Palettes/TimelineGraphicsView/SelectionRect.h
index cad62662..224284c0 100644
--- a/src/Authoring/Studio/Palettes/TimelineGraphicsView/SelectionRect.h
+++ b/src/Authoring/Studio/Palettes/TimelineGraphicsView/SelectionRect.h
@@ -39,7 +39,7 @@ public:
     void start(const QPointF &origin);
     void updateSize(const QPointF &pos, const QRectF &visibleScene);
     void end();
-    bool isActive();
+    bool isActive() const;
 
     void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
                QWidget *widget = nullptr) override;